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Pump and method for drawing vapor from a storage tank without forcibly drawing the vapor from the tank

  • US 5,139,390 A
  • Filed: 02/04/1991
  • Issued: 08/18/1992
  • Est. Priority Date: 02/04/1991
  • Status: Expired due to Term
First Claim
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1. A method of removing vapour from a storage tank, with a reciprocating pump and an expandable container, comprising the steps of:

  • filling the expandable container through an inlet line connected to the container with vapour under pressure from the storage tank; and

    forcing the vapour out of the expandable container through an outlet line with the reciprocating pump,whereby vapour is transferred from the storage tank without forcibly drawing vapour from the storage tank.

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